Why are you adding ammonia buffer in the estimation of hardness of water by EDTA method?
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But both EDTA and the indicator are themselves weak acids, therefore a buffer solution such as ammonium hydroxide-ammonium chloride buffer, which is able to maintain a fairly constant pH even when acids and bases are added, is used.
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Both EDTA and the indicator are themselves weak acids, therefore a buffer solution such as ammonium hydroxide-ammonium chloride buffer, which is able to maintain a fairly constant pH even when acids and bases are added, is used.
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